Electrically-driven forging press



o o o a @ro K @no July 17, 1928.

A. FRIEDERICI ELECTRICALLY DRIVEN FORGING PRESS Filed May 13, 1926 Patented July 17, 1928.

retin i @Ear .Ferca Asensi* FRIEDERICI, or GOLOGNE-MULHEIM, GERMANY, Assrcrivioav ro IMAX FRIEDERICI, or STEUBENVILLE, omo.

ELECTRCALLY-DRIVEN FORG'VINCT PRESS.

Application filed May 13, 1926, Serial. No. 108,807, and `in Germany J'ru'1yp14, 1925.`

. rl`hisinvention relates to forging presses and more particularly toy electrically op'erated forging presses, and has for one of its n objects the provision of a press of this class withl novel adjusting means whereby the stroke of ther forging ram may be adjusted at will and during the operation of the press.

Another object is to provide -a novel combination of elements for 'preventing the overchalrging of the press.

' Another object is to provide a press hav-` ing the novel design, construction and combination `of" partsl hereinafter described.

In the drawings;`

Fig. "1 illustratesthe side v-iew of the forging press, Fig. 2 the front view, Fig. 3 a horizontal sectionthrough the frame of the press, and Fig. 4 a section through the cylinder for the prevention of fracture.

Referring more particularly to the drawings, the letter A designates the frame of' the 'machine as a whole, which is provided at its forward side with a throat 2. An anvil 3 is mounted in the frame A at the base of the throat, and a forging ram 4 is slidably mounted in ibearings 5 on the forward face of the frame above the throat and is adapted to be reciprocated tov forge workpieces mounted on the anvil. o

The 'upper part or shank of theram 4 1s slotted, as at'4, to receive the forward end of a rocking lever 6, which llever is ful# crumed on a fulcrum Ishaft 7 The shaft 7 is `mounted in a vertically disposed screw spindle 8 journaled in `the frame A and adapted to be adjusted vertically to raise or lower the position of the fulcrum shaft V7. A nut 9 is mounted onthe spindle 8 and jou'rnaledin the frame A, and has an'integral worni-wheel 10 formed thereon, which is meshed with a worm 12 on the armature .shaft of a motor 13, to provide for power adjustment of the spindle. A pair of bear ing and guide blocks 14 are mounted on the shaft 7 and within guide slots 15 in the frame A, so as to guide the shaft 7 when the spindle 8 and shaft 7 are moved vertically.

The rocking lever 6 is fulcrumed on the shaft 7 at a point toward its forward end from its vertical center line so asy to provide a forward short arm 7a and a long rear arm 7 b.

vThe forward end of the lever 6 is cony,portion 22 of a crank shaft nccted Vby va 'link mechanism 16 and 17 to the ram 4 so las to reciprocate the ram.

The rear end of the 'llever'6 is forked and pivotal'ly connected to tru'nnion's 18 secured inthe wall lof a pressure cylinder 19. The cylinder 19 has a piston 20 therein connected to a piston rod 21 which projects below the cylinder 1'9 and is connected to the crankv .'23 journaled in bearings 2339011 a `bracket 24 on 'the frame A. A liquid supplycylinder 25 is mounted on topk of the cylinder 19 and is adapted to be filled with liquid to be drawn into the cylinder 19. An inlet valve port 26 forms a communicating passage between thecylinf.v ders 25 and 19, whichis normally closed .by a valve 27 connected to a valve rod 28 projecting upwardly through `the cylinder `25.`

A valve spring 29`is mountedfaronnd .the Y -V portion o'fjthevalve rod 28 above the cylinder 25 and is held under ten'sionby' nuts 30.

held against rotation by a pair ofy guide rods 37.' l A :lock-nut 38 is threadedon the rod `3,3 to .limit the movement of the sleeve 35.

In operation, when the piston 20 is movedV downwardly, fluid from the cylinder 25 will be drawn into the cylinderv 19 through the valve port 26, and'when vthe piston is moved upwardly on the working stroke, the fluid previously drawn into the cylinder 19 is compressed, and if the compression'exceeds a predetermined maximum, the valve 32 will automatically open to allow the escape of at least a portion `of the liquid from the cylinder 19 into the cylinder 25.

The downward stroke of the rear end of the lever 6 is limited by a cam 39 mounted on a shaft 40. The shaft 40 carries a'pinion 41 in mesh with a gear 42 on a stub shaft 43 which is meshed with a rack segment-44. The rack segment 44 is formed integral with a rocking lever 45 fulcrumed on a stub shaft 75 An escape or 'outlet valve port'31is formed -v ybetween the cylinders 25V and 19 and is nor- 46, and has its forward endconnected by a connecting link 47 with the shaft 7, so that as the shaft 7 is adjusted vertically the rack segment 44 will be operated to cause the cam Ystop 39 to be moved through the gears 41 and 42.A

The crank shaft 23. is provided with a gear 48 which is meshed with a pinion 49Y on ashaft 50; The shaft 50`also carries a gear 51 which isein mesh with a pinion .52 on ashaft 53 coupled to the' armatureV vshaft 54 of a variable speed motor `55.

Y' limits of the scale without gaging the workpieces.

In operation, the motor 55 drives the crank Y Vshaft 23 through the gears 52, 51, 49 and 4S,

and the crank shaft operates or rocks the lever 6 through the piston rod 21, piston 20 and cylinder 19.l `The lever 6rocks about the vshaft 7 and the shorterend 7 operates the` ram4, Awhile its longer end 7b serves as a receiving'lever'to receive the power from the crank shaft 23 and transmit itto the short Tor ram operating end.

`The fulcrum sliaft`7 of the'lever 6 is adapted to be adjusted vertically by means of a nut 9, worm-wheel and worm 1.0 and 12, and motor 13 so as to vary the amount of movement of the lever Gand consequently the amount of movement of the ram 4. AAn indicator 56 and scale`57 `cooperate to indi- `cate the distance between the ram 4 and anvil 3 at thevarious .points of adjustment of the shaft 7. i Y

Thecylinders 19 and 25 and their cooperating mechanism form an overfpressure .safety or relief connection to prevent the apparatus exceeding a predetermined maximum power.

` While I have shown and described one vspecific embodiment of my invention, it will.

opposite from ysaid ram, 'said'ineans includf ing a cam shaft, a cam on said shaftadapted to engage and limit the downward movement of said lever, and means operable by the vertical movement of*` said fulcrum for rotating said camshaft to vary the vposition ward movement 'of the end of said lever n Y of said camand thereby vary thedownward v movement of said lever. 1 l Y 2. A forging press comprising a housing, an anvil on said housing, a reciprocatory ram, a rocking lever for reciprocating said rain, a fulerum l`shaft for said lever, Asaid fulcrum shaft being vertically movable relative to said housing, a vertical screwspindle journaled in said housing and supporting said fulcrum shaft, a nut having a threaded engagement with said spindle and journaled in said housing, power means for'operating said nut to cause a vertical movement of said spindle andl said fulcrum shaft, and adjustable means for limiting the downward y movement of the rear end of said lever, said means including a cam shaft, a cannon said shaft adapted to engage and limit the down` ward movement of said lever, a pinion on said cam shaft, and means including a rocking lever having a rock segment thereon in mesh with said pinion and voperable by the vertical movement of said fulcrum sliaftrfor rotating said cam shaft to vary the position of saidcam and thereby vary the downward Vmovement of said lever.

In testimony whereof I have hereunto set my hand.

AUGUST rninnniuoi. 

